CN107118105A - The method that coupling bipolar membrane electrodialysis and membrane distillation prepare methyl triethylammonium hydroxide - Google Patents
The method that coupling bipolar membrane electrodialysis and membrane distillation prepare methyl triethylammonium hydroxide Download PDFInfo
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- CN107118105A CN107118105A CN201710534057.3A CN201710534057A CN107118105A CN 107118105 A CN107118105 A CN 107118105A CN 201710534057 A CN201710534057 A CN 201710534057A CN 107118105 A CN107118105 A CN 107118105A
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- methyl
- electrodialysis
- triethylammonium hydroxide
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
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Abstract
The method that bipolar membrane electrodialysis and membrane distillation prepare methyl triethylammonium hydroxide is coupled the invention discloses a kind of.A kind of methyl triethyl ammonium saline solution of four compartments bipolar membrane electrodialysis technical finesse low concentration is employed so as to obtain high-purity methyl triethylammonium hydroxide, while being concentrated into high concentration using film distillation technology for present invention design the shortcomings of traditional bipolar membrane process can not produce high concentration soda acid, product purity is not high.Because the cell structure that the present invention is used avoids halide ion from leaking to alkali room polluted product solution from Bipolar Membrane, the production for being alkylated quaternary ammonium base for high-purity provides quality assurance；In addition the film distillation technology of use of the invention is easy to operate, and process does not result in environmental pollution.
Description
Technical field
The method that bipolar membrane electrodialysis and membrane distillation prepare methyl triethylammonium hydroxide is coupled the present invention relates to a kind of.
Background technology
Methyl triethylammonium hydroxide has been widely used in field tools such as fine chemistry industry, miniature carving developments, but the second of methyl three
The production of base ammonium hydroxide is limited by its production technology, it is difficult to meet the demand in market.Methyl triethylammonium hydroxide
Conventional production methods have an electrolysis, ion-exchange-resin process, silver oxide method, electrolemma reactor method etc., but these methods are present
It is difficult to the defect overcome：Electrolysis energy consumption is higher, and its process has accessory substance Cl2Produce；Ion-exchange-resin process conversion ratio
Not high, a large amount of discharging of waste liquid of simultaneous easily cause harm to environment；Silver oxide method production cost is costly, it is impossible to
Carry out large-scale industrial production；Electrolemma reactor method can prepare the methyl triethylammonium hydroxide of high-purity, but it is produced
Process energy consumption is higher, it is difficult to long-range under energy-saving state basic policy to base oneself upon.Therefore, methyl triethylammonium hydroxide manufacturing enterprise is urgently
A kind of new low energy consumption and environment-friendly production line need to be researched and developed to go to prepare the methyl triethylammonium hydroxide of high-purity.
The content of the invention
In order to solve the problem of prior art is present, the invention provides one kind coupling bipolar membrane electrodialysis and membrane distillation system
The method of standby methyl triethylammonium hydroxide, the present invention can not introduce the situation of new component using bipolar membrane electrodialysis technology
The lower salt by the aqueous solution is converted into the advantage of corresponding bronsted lowry acids and bases bronsted lowry, and membrane distillation separative efficiency is high, operating condition is gentle, right
The advantages of mechanical property requirements of film and feed liquid interphase interaction and film are not high with overcome bipolar membrane electrodialysis production high concentration
The defect of soda acid, so as to realize methyl triethylammonium hydroxide high-quality, low cost, the production of high concentration.
To achieve the above object, the present invention adopts the technical scheme that coupling bipolar membrane electrodialysis and membrane distillation prepare methyl
The method of triethylammonium hydroxide, is prepared using bipolar membrane electrodialysis device and membrane component, the Bipolar Membrane electric osmose
Analysis apparatus includes：Respectively positioned at both sides cathode chamber and anode chamber, and the cathode chamber and anode chamber between electrodialysis every
Room, the electrodialysis compartment is made up of the film unit of some groups of arranged in series, the film unit by be sequentially arranged at intervals first
Bipolar Membrane BM1, the first cation-exchange membrane CM1, anion-exchange membrane AM1, the second cation-exchange membrane CM2, the second Bipolar Membrane
BM2 is constituted, and buffer chamber, acid solution room, feed liquid room, alkali lye room are constituted successively between adjacent membranes；Concretely comprise the following steps：First, by matter
Measure fraction and add the feed liquid room for 5~10% methyl triethyl ammonium saline solution, the acid solution room in alkali lye room with distinguishing
Frame, which enters in pure water, the cathode chamber, anode chamber, buffer chamber, each leads into sulfuric acid solution；Then the bipolar membrane electrodialysis is given
Device applies DC electric field, and bipolar membrane electrodialysis processing is carried out under electric field force effect；Then, the alkali lye room obtains low concentration
Methyl triethylammonium hydroxide solution, collected feeding fluid reservoir C as membrane distillation solution to be concentrated；Finally, by liquid storage
Solution to be concentrated in tank C is heated to 30~70 DEG C, after temperature is constant, and the feed side of feeding membrane component carries out membrane distillation,
Membrane distillation process, the methyl triethyl group hydrogen after being concentrated are completed during through continuous concentration cycles to mass fraction for 15%-20%
Ammonium hydroxide solution.The film unit is 1-500 groups, this 1-500 group film unit arranged in series.Prepared in the alkali lye room
Methyl triethylammonium hydroxide mass fraction is that the concentration impurity ion in 3%~9%, solution is less than 60ppm, then passes through film
Distill component and carry out distillation and concentration.
In one embodiment of the invention, the methyl triethyl ammonium saline solution is passed through the feed liquid room in fluid reservoir A,
The surge chamber obtains halogen acids, and the halogen acids is recycled to fluid reservoir B and for the preparation of methyl triethyl ammonium salt, after concentration
Methyl triethylammonium hydroxide solution collect to fluid reservoir D.
In one embodiment of the invention, the methyl triethyl ammonium salt includes but is not limited to methyl triethyl ammonium chloride, first
Base triethylammonium bromide.
In one embodiment of the invention, the membrane component is plate type membrane assembly or hollow fiber form membrane module.
In one embodiment of the invention, described membrane component is hydrophobic microporous membrane, polyvinylidene fluoride dewatering film,
One or more in polypropylene hydrophobic film, the hydrophobic film after hydrophobic modified.Hollow fibre after hydrophobic modified
Tie up hydrophobic film component.
In one embodiment of the invention, the membrane distillation process is direct contact membrane distillation, vacuum type membrane distillation or gas
Gap type membrane distillation.
During direct contact membrane distillation, its process is：(1) methyl triethylammonium hydroxide solution is heated to 30~70
℃；(2) after solution temperature is stable, the feed side that methyl triethylammonium hydroxide solution is passed through membrane component carries out film steaming
Evaporate, be coolant in the cold side of direct contact membrane distillation component, and temperature is maintained in the range of 0~30 DEG C.Through repeatedly dense
Contracting circulation, feed liquid be concentrated into mass fraction for 15~20% when, that is, complete membrane distillation process, collect concentrate to fluid reservoir D.Its
Described in coolant be water.
During vacuum type membrane distillation process, its process is：(1) methyl triethylammonium hydroxide solution is heated to 30~70
℃；(2) after solution temperature is stable, the feed side for the membrane component that methyl triethylammonium hydroxide solution is passed through carries out film steaming
Evaporate.Vacuum is evacuated to for 0.2~2.5kPa in the cold side of membrane module.Through concentration cycles repeatedly, feed liquid is concentrated into quality
When fraction is 15~20%, that is, membrane distillation process is completed, collect concentrate to fluid reservoir D.
During gap field orientation process, its process is：(1) methyl triethylammonium hydroxide solution is heated to 30~70
℃；(2) after solution temperature is stable, the feed side that methyl triethylammonium hydroxide solution is passed through membrane component carries out film steaming
Evaporate, while the coolant of membrane component is cooled to -4~6 DEG C through the condenser in component, through concentration cycles repeatedly, feed liquid is dense
Be reduced to mass fraction for 15~20% when, that is, complete membrane distillation process, collect concentrate and collect concentrate to fluid reservoir D.Wherein
The coolant is that volumn concentration is 20~65% glycol waters.
In one embodiment of the invention, the bipolar membrane electrodialysis device has several, and several described Bipolar Membranes electricity
Electrodialysis apparatus serial or parallel connection.The number of the bipolar membrane electrodialysis device is provided with 1-50.
In one embodiment of the invention, the first Bipolar Membrane BM1, the first cation-exchange membrane CM1, anion-exchange membrane
AM1, the second cation-exchange membrane CM2, the second Bipolar Membrane BM2 are all homogeneous membrane.The first Bipolar Membrane BM1 and the second Bipolar Membrane
BM2 is two preparation methods, Bipolar Membrane identical or different in structure, the sun of the first cation-exchange membrane CM1 and second from
Proton exchange CM2 is identical or different cation-exchange membrane.
In one embodiment of the invention, in bipolar membrane electrodialysis processing procedure, the DC electric field current density is remained
100~600A/m2, the running temperature of bipolar membrane electrodialysis device is 20~35 DEG C, each compartment flow rate of liquid control for 100~
1000L/h。
In one embodiment of the invention, the mass fraction of the sulfuric acid solution is 1%~3%.
The technical program has the advantages that：
The four compartment bipolar membrane electrodialysis modes that the present invention is used, in the Bipolar Membrane and anion-exchange membrane close to anode-side
Between put a cation-exchange membrane, this cation-exchange membrane can effectively stop the Br in sour room-Through Bipolar Membrane
Into alkali room, so as to reach the purpose for obtaining high-purity methyl triethylammonium hydroxide.Easy to operate, thickening efficiency of the invention
The advantages of height, non-pollutant discharge.
The present invention is integrated by bipolar membrane electrodialysis technology and film distillation technology progress, and production process mid-early stage uses low concentration
Methyl triethyl ammonium salting liquid carries out bipolar membrane electrodialysis processing, it is to avoid occurs Ion-leakage in processing procedure, extends film
The service life of unit.Further concentrated using film distillation technology for the feed liquid after the completion of bipolar film process, improve product
Concentration, meets the market demand.
Brief description of the drawings
Fig. 1 is the technique flow graph that present invention coupling bipolar membrane electrodialysis and membrane distillation prepare methyl triethylammonium hydroxide.
1st, fluid reservoir A；2nd, four compartment bipolar membrane electrodialysis device；3rd, fluid reservoir B；4th, fluid reservoir C；5th, distillation device；
6th, fluid reservoir D.
Embodiment
With reference to embodiment and accompanying drawing 1, the invention will be further described.
Embodiment 1
The bipolar membrane electrodialysis system that this example is used for 1 bipolar membrane electrodialysis device, the device by both sides pole liquid
Room and the electrodialysis compartment composition being clipped in the middle of two side pole liquid rooms, pole liquid room is respectively cathode chamber and anode chamber, electrodialysis compartment
It is made up of 15 groups of film unit arranged in series, the film unit is that four cell structures are a Bipolar Membrane BM1, a cation exchange
Film CM1, an anion-exchange membrane AM1, a cation-exchange membrane CM2, a Bipolar Membrane BM2It is spaced composition buffer solution
Room, acid solution room, feed liquid room, alkali lye room.The Bipolar Membrane that wherein uses, cation-exchange membrane, anion-exchange membrane are homogeneous for business
Film, and negative electrode, anode etc. use Ti-Ru electrode.
In addition, the membrane distillation equipment that this example is used is adopted for the doughnut hydrophobic film component after hydrophobic modified
Use direct contact membrane distillation mode.By the methyl triethylammonium bromide 2L aqueous solution that the mass fraction in fluid reservoir A is 4.7%
It is passed through in the feed liquid room of electrodialysis plant, acid solution room is respectively passed through pure water 2L with alkali lye room, and pole liquid room is each led into buffer chamber
Mass fraction is 3% sulfuric acid solution 2L.Apply DC electric field, bipolar membrane electrodialysis processing procedure on positive plate and minus plate
In, DC electric field current density remains 300A/m2, the running temperature of bipolar membrane electrodialysis device is 21 DEG C, each compartment liquid
Flow control is 250L/h.Under electric field force effect, the methyltriethylammonium cation and bromide ion of feed liquid room are respectively through sun
Amberplex and anion-exchange membrane enter alkali room and surge chamber.In alkali lye room, methyltriethylammonium cation and Bipolar Membrane
The hydroxide ion that water decomposition is produced combines being produced by Bipolar Membrane water decomposition in generation methyl triethylammonium hydroxide, acid solution room
Hydrogen ion through cation-exchange membrane enter surge chamber and combined with bromide ion and generate mass fraction for 3.9% hydrobromic acid 2L.Through
After the completion of bipolar membrane electrodialysis processing, the hydrobromic acid that surge chamber is obtained is recycled to fluid reservoir B and for methyl triethyl ammonium salt
Prepare.Alkali lye room obtain for 5.1% methyl triethylammonium hydroxide solution 2L, collected feeding fluid reservoir C as film
Distillation and concentration feed liquid.
Solution to be concentrated in fluid reservoir B is heated to 30 DEG C.After temperature is constant, methyl triethylammonium hydroxide solution
Be passed through membrane component feed side carry out membrane distillation, direct contact membrane distillation component cold side be coolant, and temperature
Degree is maintained in the range of 10 DEG C.Through concentration cycles repeatedly, feed liquid be concentrated into mass fraction for 14.27% when, that is, complete membrane distillation
Process, collects concentrate to fluid reservoir D.Wherein described coolant is water.
Embodiment 2
The bipolar membrane electrodialysis system that this example is used for 1 bipolar membrane electrodialysis device, the device by both sides pole liquid
Room and the electrodialysis compartment composition being clipped in the middle of two side pole liquid rooms, pole liquid room is respectively cathode chamber and anode chamber, electrodialysis compartment
It is made up of 20 groups of film unit arranged in series, the film unit is that four cell structures are a Bipolar Membrane BM1, a cation exchange
Film CM1, an anion-exchange membrane AM1, a cation-exchange membrane CM2, a Bipolar Membrane BM2It is spaced composition buffer solution
Room, acid solution room, feed liquid room, alkali lye room.The Bipolar Membrane that wherein uses, cation-exchange membrane, anion-exchange membrane are homogeneous for business
Film, and negative electrode, anode etc. use Ti-Ru electrode.
In addition, the membrane distillation equipment that this example is used is adopted for the doughnut hydrophobic film component after hydrophobic modified
With vacuum type membrane distillation mode.
Mass fraction in fluid reservoir A is passed through electrodialysis plant for the 6.9% methyl triethylammonium bromide 8L aqueous solution
Feed liquid room in, acid solution room and alkali lye room are respectively passed through pure water 8L, and pole liquid room each leads into mass fraction for 3% sulphur with buffer chamber
Acid solution 8L.Apply on positive plate and minus plate in DC electric field, bipolar membrane electrodialysis processing procedure, DC electric field electric current is close
Degree remains 600A/m2, the running temperature of bipolar membrane electrodialysis device is 20 DEG C, and each compartment flow rate of liquid control is 700L/h.
Under electric field force effect, each compartment flow rate of liquid control is 250L/h.Under electric field force effect, the methyl triethyl ammonium of feed liquid room
Cation and bromide ion enter alkali lye room and surge chamber through cation-exchange membrane and anion-exchange membrane respectively.In alkali lye room,
Methyltriethylammonium cation is combined generation methyl triethylammonium hydroxide, acid with the hydroxide ion that Bipolar Membrane water decomposition is produced
The hydrogen ion produced by Bipolar Membrane water decomposition in room is combined generation matter with bromide ion through cation-exchange membrane into surge chamber
Amount fraction is 6.1% hydrobromic acid 7L.After the completion of being handled through bipolar membrane electrodialysis, the hydrobromic acid that surge chamber is obtained is recycled to fluid reservoir
B and the preparation for being used for methyl triethyl ammonium salt.Alkali lye room obtain for 6.7% methyl triethylammonium hydroxide solution 7L, will
It is collected feeding fluid reservoir C and is used as membrane distillation concentration feed liquid.
Solution to be concentrated in fluid reservoir B is heated to 33 DEG C.After solution temperature is stable, methyl triethylammonium hydroxide
The feed side for the membrane component that solution is passed through carries out membrane distillation.Being evacuated to vacuum in the cold side of membrane module is
1.2kPa,.Through concentration cycles repeatedly, feed liquid be concentrated into mass fraction for 18.88% when, that is, complete membrane distillation process, collect it is dense
Contracting liquid is to fluid reservoir D.
Embodiment 3
The bipolar membrane electrodialysis system that this example is used for 1 bipolar membrane electrodialysis device, the device by both sides pole liquid
Room and the electrodialysis compartment composition being clipped in the middle of two side pole liquid rooms, pole liquid room is respectively cathode chamber and anode chamber, electrodialysis compartment
It is made up of 40 groups of film unit arranged in series, the film unit is that four cell structures are a Bipolar Membrane BM1, a cation exchange
Film CM1, an anion-exchange membrane AM1, a cation-exchange membrane CM2, a Bipolar Membrane BM2It is spaced composition buffer solution
Room, acid solution room, feed liquid room, alkali lye room.The Bipolar Membrane that wherein uses, cation-exchange membrane, anion-exchange membrane are homogeneous for business
Film, and negative electrode, anode etc. use Ti-Ru electrode.
In addition, the membrane distillation equipment that this example is used is adopted for the doughnut hydrophobic film component after hydrophobic modified
Use gap field orientation mode.
The tetraethylammonium bromide 15L aqueous solution that mass fraction in fluid reservoir A is 6.8% is passed through to the material of electrodialysis plant
In liquid room, acid solution room is respectively passed through pure water 15L with alkali lye room, and pole liquid room each leads into mass fraction for 3% sulfuric acid with buffer chamber
Solution 15L.Apply on positive plate and minus plate in DC electric field, bipolar membrane electrodialysis processing procedure, DC electric field electric current is close
Degree remains 600A/m2, the running temperature of bipolar membrane electrodialysis device is 20 DEG C, and each compartment flow rate of liquid control is 800L/h.
Under electric field force effect, under electric field force effect, the methyltriethylammonium cation and bromide ion of feed liquid room respectively through sun from
Proton exchange and anion-exchange membrane enter alkali lye room and surge chamber.In alkali lye room, methyltriethylammonium cation and Bipolar Membrane
The hydroxide ion that water decomposition is produced combines being produced by Bipolar Membrane water decomposition in generation methyl triethylammonium hydroxide, acid solution room
Hydrogen ion through cation-exchange membrane enter surge chamber and combined with bromide ion and generate mass fraction for 5.4% hydrobromic acid 14.5L.
After the completion of being handled through bipolar membrane electrodialysis, the hydrobromic acid that surge chamber is obtained is recycled to fluid reservoir B and for methyl triethyl ammonium salt
Preparation.Alkali lye room obtain for 5.8% methyl triethylammonium hydroxide solution 14L, collected feeding fluid reservoir C conducts
Membrane distillation concentration feed liquid.
Solution to be concentrated in fluid reservoir B is heated to 40 DEG C.After solution temperature is stable, methyl triethylammonium hydroxide
The feed side that solution is passed through membrane component carries out membrane distillation, while the coolant of membrane component is cold through the condenser in component
But to 4 DEG C, through concentration cycles repeatedly, feed liquid be concentrated into mass fraction for 16.3% when, that is, complete membrane distillation process, collect concentration
Liquid is to fluid reservoir D.Wherein described coolant is that volumn concentration is 55% glycol water.
Above-mentioned specific embodiment is used only to illustrate the present invention, rather than is to limit the invention, in the present invention
Objective and scope of the claims in, to any replacement and change for not paying creative work for making of the present invention,
Fall within the protection domain of patent of the present invention.
Claims (10)
1. a kind of couple the method that bipolar membrane electrodialysis and membrane distillation prepare methyl triethylammonium hydroxide, it is characterised in that adopts
Prepared with bipolar membrane electrodialysis device and membrane component, the bipolar membrane electrodialysis device includes：It is located at both sides respectively
Cathode chamber and anode chamber, and the cathode chamber and anode chamber between electrodialysis compartment, the electrodialysis compartment is by some
Group arranged in series film unit constitute, the film unit by be sequentially arranged at intervals the first Bipolar Membrane BM1, the first cation exchange
Film CM1, anion-exchange membrane AM1, the second cation-exchange membrane CM2, the second Bipolar Membrane BM2 compositions, structure successively between adjacent membranes
Into buffer chamber, acid solution room, feed liquid room, alkali lye room；Concretely comprise the following steps：First, by mass fraction be 5~10% the second of methyl three
Frame enters pure water, the cathode chamber, anode respectively in the base ammonium salt aqueous solution addition feed liquid room, the acid solution room and alkali lye room
Sulfuric acid solution is each led into room, buffer chamber；Then DC electric field is applied to the bipolar membrane electrodialysis device, in electric field force
Effect is lower to carry out bipolar membrane electrodialysis processing；Then, alkali room obtains the methyl triethylammonium hydroxide solution of low concentration, is received
Collection sends into fluid reservoir C as the solution to be concentrated of membrane distillation；Finally, the solution to be concentrated in fluid reservoir C is heated to 30~70 DEG C, treated
After temperature is constant, the feed side of feeding membrane component carries out membrane distillation, is 15%- through continuous concentration cycles to mass fraction
Membrane distillation process, the methyl triethylammonium hydroxide solution after being concentrated are completed when 20%.
2. coupling bipolar membrane electrodialysis according to claim 1 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the methyl triethyl ammonium saline solution is passed through the feed liquid room in fluid reservoir A, the surge chamber is obtained
To halogen acids, the halogen acids is recycled to fluid reservoir B and for the preparation of methyl triethyl ammonium salt, the methyl triethyl group after concentration
Ammonia is collected to fluid reservoir D.
3. coupling bipolar membrane electrodialysis according to claim 2 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the methyl triethyl ammonium salt includes but is not limited to methyl triethyl ammonium chloride, methyl triethyl group bromination
Ammonium.
4. coupling bipolar membrane electrodialysis according to claim 1 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the membrane component is plate type membrane assembly or hollow fiber form membrane module.
5. coupling bipolar membrane electrodialysis according to claim 4 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that described membrane component is hydrophobic microporous membrane, polyvinylidene fluoride dewatering film, polypropylene hydrophobic
One or more in film, the hydrophobic film after hydrophobic modified.
6. coupling bipolar membrane electrodialysis according to claim 4 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the membrane distillation process is direct contact membrane distillation, vacuum type membrane distillation or gap field orientation.
7. coupling bipolar membrane electrodialysis according to claim 1 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the bipolar membrane electrodialysis device has several, and several described bipolar membrane electrodialysis devices series connection or
It is in parallel.
8. coupling bipolar membrane electrodialysis according to claim 1 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the first Bipolar Membrane BM1, the first cation-exchange membrane CM1, anion-exchange membrane AM1, the second cation
Exchange membrane CM2, the second Bipolar Membrane BM2It is all homogeneous membrane.
9. methyl triethyl group hydroxide is prepared according to any described coupling bipolar membrane electrodialysis of claim 1 to 8 and membrane distillation
The method of ammonium, it is characterised in that in bipolar membrane electrodialysis processing procedure, the DC electric field current density remains 100~
600A/m2, the running temperature of bipolar membrane electrodialysis device is 20~35 DEG C, and each compartment flow rate of liquid control is 100~1000L/
h。
10. coupling bipolar membrane electrodialysis according to claim 9 and membrane distillation prepare the side of methyl triethylammonium hydroxide
Method, it is characterised in that the mass fraction of the sulfuric acid solution is 1%~3%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108467347A (en) * | 2018-03-22 | 2018-08-31 | 新乡化纤股份有限公司 | A method of electrolysis tetrabutyl ammonium sulfate recycles tetrabutylammonium hydroxide |
| CN111138390A (en) * | 2019-12-30 | 2020-05-12 | 杭州蓝然环境技术股份有限公司 | Improved cleaning process for preparing vitamin C by membrane method |
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| CN105833729A (en) * | 2016-05-12 | 2016-08-10 | 浙江赛特膜技术有限公司 | Bipolar membrane electrodialysis system and method for preparing high-purity tetramethylammonium hydroxide through system |
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- 2017-07-03 CN CN201710534057.3A patent/CN107118105A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105833729A (en) * | 2016-05-12 | 2016-08-10 | 浙江赛特膜技术有限公司 | Bipolar membrane electrodialysis system and method for preparing high-purity tetramethylammonium hydroxide through system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108467347A (en) * | 2018-03-22 | 2018-08-31 | 新乡化纤股份有限公司 | A method of electrolysis tetrabutyl ammonium sulfate recycles tetrabutylammonium hydroxide |
| CN111138390A (en) * | 2019-12-30 | 2020-05-12 | 杭州蓝然环境技术股份有限公司 | Improved cleaning process for preparing vitamin C by membrane method |
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Application publication date: 20170901 |